On my Xcover there are some factory apps but there doesn't appear to me a music player, just a radio app. I figured I must've looked for a factory app when they first got rid of Play but I've just copied some fresh tunes to the phone so thinking about players again obvs
Manufacturer apps in practice, i.e. Sony Music and Samsung Music. If you don't have one of those phones, VLC is my fallback option for everything.